20631270 has 64 divisors (see below), whose sum is σ = 54639360. Its totient is φ = 4944000.

The previous prime is 20631269. The next prime is 20631293. The reversal of 20631270 is 7213602.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 33021 + ... + 33639.

It is an arithmetic number, because the mean of its divisors is an integer number (853740).

Almost surely, 2^20631270 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20631270, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27319680).

20631270 is an abundant number, since it is smaller than the sum of its proper divisors (34008090).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20631270 is a wasteful number, since it uses less digits than its factorization.

20631270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 741.

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 20631270 is about 4542.1657829718. The cubic root of 20631270 is about 274.2681144926.

Adding to 20631270 its reverse (7213602), we get a palindrome (27844872).

It can be divided in two parts, 2063 and 1270, that added together give a palindrome (3333).

The spelling of 20631270 in words is "twenty million, six hundred thirty-one thousand, two hundred seventy".